We have a mid 90s GE electric dryer which has recently developed a strange issue. I always use automatic cycle rather than timed. I also usually use medium heat. Lately I found the timer not advancing. If I remember correctly these GE's use a heat sensor rather than moisture sensor to advance the timer. I figured the sensor had gone bad and needed replacing. But I found that it works correctly and timer advances if set on high heat. Would the issue still be the sensor? Maybe it has gone out of spec and air temp when set on medium doesn't get hot enough to satisfy it but when set to hot it does?